Letter to Caroline Sturgis
p43“No one can predict what will be the fate of these Undine's when they get their souls by wedlock.”
Fuller, Margaret. The Letters of Margaret Fuller. Edited by Robert N. Hudspeth. Vol. II. Ithaca: Cornell University Press, 1984.
Inferred Fuller alludes to Fouqué's Undine (1811) by referencing women who "get their souls by wedlock," echoing the novella's central conceit that the water sprite Undine gains a soul through marriage to the knight Huldbrand.